Title (fr)

Publication

Application

Priority

GB 9725140 A 19971127

Abstract (en)

[origin: EP0919523A2] The method of this invention is effective for removal of colloidal and other suspended particles, and the reduction of boron from lightly polluted water such as grey water (soap solution), underground water in built up areas, and any other lightly polluted water, after flocculation, sedimentation and filtration. In general, this method includes the introduction into the lightly polluted water such as grey water, of a complex chemical solution which is produced from the natural oxidation of iron pyrites and its surrounding rock formations. With the introduction of this complex chemical solution several chemical reactions may take place together with flocculation and sedimentation of suspended particles (colloidal and other suspended particles) and boron. Following this, the lightly polluted water such as grey water is passed through upflow and downflow filters, so that the remaining suspended particles are removed. Each filter bed consists of a slab of flexible polyurethane foam, up to 10 cm in depth. The purpose of this treatment is the recycling of lightly polluted water, such as grey water for re-use for flushing toilets (WC's) and/or for garden irrigation/watering of the house from which it has been collected. <IMAGE>